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Method for eliminating noise of capacitive touch screen and capacitive touch screen

A capacitive touch screen, noise technology, applied in electrical digital data processing, data processing input/output process, instruments and other directions, can solve problems such as poor stability and control performance of capacitive touch screen, save system resource overhead, improve The effect of detection accuracy and yield improvement

Active Publication Date: 2013-03-13
MILKYWAYSILICON TECH
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Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the object of the present invention is to provide a method for eliminating noise on a capacitive touch screen and a capacitive touch screen, aiming at solving the problems of poor stability and controllability of the existing capacitive touch screen

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  • Method for eliminating noise of capacitive touch screen and capacitive touch screen

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Embodiment Construction

[0027] The present invention provides a method for eliminating noise on a capacitive touch screen and a capacitive touch screen. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] see figure 1 , figure 1 It is a flow chart of a preferred embodiment of the method for eliminating capacitive touch screen noise of the present invention, as shown in the figure, which includes steps:

[0029] S101. Acquire in advance the noise ratio R of the noise of the first scan line and the noise of the second scan line on the capacitive touch screen, the first scan line is adjacent to the second scan line;

[0030] S102. Use a signal sampling circuit to measure the total signal of the first scan line, and use a nois...

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Abstract

The invention discloses a method for eliminating noise of a capacitive touch screen and the capacitive touch screen. The method comprises the following steps of firstly, obtaining a noise ratio R of noise of a first scanning line to noise of a second scanning line on the capacitive touch screen in advance, wherein the first scanning line is adjacent to the second scanning line; measuring a total signal of the first scanning line by a signal sampling circuit, and measuring the noise of the second scanning line by a noise sampling circuit; and multiplying the noise of the second scanning line with the noise ratio R to obtain the noise of the first scanning line, and subtracting the noise of the first scanning line from the total signal of the first scanning line to obtain a denoised signal of the first scanning line. The method and the capacitive touch screen have the advantages that the common-mode voltage instantaneous noise ofsuch as LCD (liquid crystal display), wave noise of a power supply and radiation noise of environments are effectively eliminated; the cost of system resources is saved, the finished rate of the capacitive touch screen is improved, and the detection precision of finger tracks on the capacitive touch screen is improved.

Description

technical field [0001] The invention relates to the field of capacitive touch screens, in particular to a method for eliminating noise on the capacitive touch screen and the capacitive touch screen. Background technique [0002] In the capacitive touch screen sensing system, there are mainly two kinds of electronic signal noise interference effects, referred to as noise: the first is Electro Magnetic Interference (EMI for short), which mainly comes from the peripheral electronics on the capacitive touch screen. The interference of the device to the sensor; the second type of noise interference is brought when the finger approaches or touches the capacitive touch screen. Noise interference seriously affects the stability and control performance of the touch screen sensing system. Therefore, for designers of capacitive touch screen systems, how to establish a stable, effective and reliable touch system in an actual application environment is a challenge. [0003] Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 钟尚书刘彦甫李湘村
Owner MILKYWAYSILICON TECH
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